EP0869857B1 - Verfahren zur herstellung von hartmetallbauteilen - Google Patents
Verfahren zur herstellung von hartmetallbauteilen Download PDFInfo
- Publication number
- EP0869857B1 EP0869857B1 EP96942363A EP96942363A EP0869857B1 EP 0869857 B1 EP0869857 B1 EP 0869857B1 EP 96942363 A EP96942363 A EP 96942363A EP 96942363 A EP96942363 A EP 96942363A EP 0869857 B1 EP0869857 B1 EP 0869857B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hard metal
- thermoplastic binder
- hard
- mpa
- viscosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
Definitions
- the invention relates to the fields of ceramics and the hard metal industry and relates to a method for producing hard metal components, in particular with complicated geometries, e.g. as editing tools and Wear elements are used.
- Ceramic or powder metallurgy components of complicated geometry can be manufactured by starting with a mechanical molded body Post processing of the outer contours. It is with such materials possible post-processing in molded, sintered or one between them Perform process steps given state. The increases Processing effort with the hardness of the material in the respective state, with the Complexity of the geometry and with the number of pieces.
- thermoplastic molding process which is based on the liquefaction of non-plastic ceramic powder by paraffins and waxes is based.
- the shape of thermoplastic suspensions is already low Pressing possible (SU 137807).
- the process is hot pouring or Called low pressure injection molding.
- Different ceramic materials Alluminum oxide, zirconium oxide, silicon carbide
- the material-specific peculiarities lie primarily in the offset of the thermoplastic binder, which in any case surfactants for the Modification of the powder surface includes (SU 298566, SU 298567, DD 139397, DD 233117, DD 233119, SU 1590468).
- Machine concepts for the realization of the Shaping processes are known (US 4416603, DD 281913). An overview on the hot casting process is also published (Lenk, R. Technische Ceramic materials, chapter 3.4.8.1).
- a method for producing is also known Molded parts made of sintered materials by injection molding, in which one pretreated metal powder and an organic binder a plasticized Mass is processed, which after the expulsion of the binder subsequent injection molding into molded parts and then sintered.
- the binder consists of paraffin and polyethylene wax.
- thermoplastic binder 3rd up to 6 mPa s
- high density differences between the hard metal powder and the binder used (12 to 24 times) no stable dispersed thermoplastic Suspensions can be made.
- thermoplastic suspensions are the prerequisite for the production of Green bodies with reproducible homogeneity and density and thus for one production-ready industrial implementation.
- the manufacture of sintered hard metal articles by injection molding is also known Mixing hard metal powder with a liquefied thermoplastic binder, where the mixture has a viscosity of 20 - 4000 Pa s and the binder from the Injection molded articles is expelled thermally, powder Metallurgy, Vol. 31, No. 2, 1988, pp. 106-112, Fig. 2, 4.
- the object of the invention is to provide a method for producing Specify carbide components in the case of carbide components with complex Geometries can be created using a stable disperse Tungsten carbide binder suspension with a thermoplastic binder with a viscosity from 3 to 6 mPa s and without using an organic solvent Childbirth.
- a hard metal powder with an average grain size ⁇ 2.0 ⁇ m with a liquefied one thermoplastic binder mixed the viscosity of the mixture during the total manufacturing and processing to a value of at least 100 mPa s and until ⁇ 4000 mPa s is set, and the resulting stable dispersion Suspension is processed into a shaped body, from which the expelled thermoplastic binder and then the debindered molding is sintered.
- Paraffins, waxes and. are advantageously used as thermoplastic binders surfactant additives used.
- hard materials are WC, TaC, NbC, VC TiC Mo 2 C, Co, Ni or mixtures of these hard materials in powder form.
- Hard material powders with an average grain size of 0.5 are also advantageous up to 1.5 ⁇ m used.
- the viscosity of the mixture of hard metal powder and liquefied thermoplastic binder throughout the manufacturing process and Processing is set to a value of 100 to 2000 mPa s.
- the method according to the invention makes it possible to have a stable dispersion Hard-thermoplastic binder suspension to produce, which then by means Hot molding (low pressure injection molding) can be processed into a shaped body can.
- a hard material powder mixture consisting of 16.6% by mass of Co, 87.8% by mass of WC and 1.6% by mass of TaC, NbC, VC, with an average grain size of 0.9 ⁇ m
- a thermoplastic binder consisting of 25 g paraffin and 5 g stearic acid, processed as follows to form a slip (suspension).
- the binder constituents paraffin and stearic acid are melted in a heated stirred vessel at 80 ° C. and 300 g of the hard metal powder are added. This mixture is stirred intensively.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Description
Bekannt ist das Spritzgießen von Pulvermetall und Keramik, das darauf beruht, daß ein unplastisches Pulver mit einem thermoplastischen Kunststoffbinder vermischt wird und eine bei höheren Temperaturen unter Druck fließfähige Spritzgußmasse entsteht, die auf herkömmlichen Kunststoffspritzgießmaschinen verarbeitet werden kann (US 2122960, DE 680250).
Die Binderbestandteile Paraffin und Stearinsäure werden in einem beheizten Rührgefäß bei 80 °C aufgeschmolzen und 300 g des Hartmetallpulvers wird dazugegeben. Diese Mischung wird intensiv gerührt. Da sich während des Rührens die Viskosität der Mischung deutlich verringert, werden vor Unterschreiten einer Viskosität von 100 mPa s weitere 100 g des Hartstoffpulvergemisches zu der Mischung gegeben. Dadurch wird die Viskosität der Mischung sofort erhöht und die Sedimentationsstabilität des Schlickers ist weiterhin gegeben. Nach weiterem intensiven Rühren werden die restlichen 100 g Hartstoffpulver zugegeben und weiterhin gerührt.
Der so hergestellte Schlicker wird aus einem Vorratsbehälter, der mit einem Druck von 0,6 MPa beaufschlagt ist, über ein Rohrleitungssystem in eine geschlossene Form mit der Negativbauteilform mit einer komplexen Geometrie gefördert. Nach dem Erkalten des Schlickers wird die Form geöffnet, das Bauteil durch langsame Temperaturerhöhung unter Inertgas bis 300 °C entbindert und anschließend bei 1450 °C gesintert.
Claims (6)
- Verfahren zur Herstellung von Hartmetallbauteilen, bei dem ein Hartmetallpulver einer mittleren Korngröße < 2,0 µm mit einem verflüssigten thermoplastischen Binder gemischt wird, wobei die Viskosität der Mischung während der gesamten Herstellung und Verarbeitung auf einen Wert von mindestens 100 mPa s und bis < 4000 mPa s eingestellt wird, und die so erhaltene stabildisperse Suspension zu einem Formkörper verarbeitet wird, aus dem anschließend das thermoplastische Bindemittel ausgetrieben und der entbinderte Formkörper dann gesintert wird.
- Verfahren nach Anspruch 1, bei dem als thermoplastischer Binder Paraffine, Wachse und grenzflächenaktive Zusätze eingesetzt werden.
- Verfahren nach Anspruch 1, bei dem als Hartstoffe WC, TaC, NbC, VC, TiC, Mo2C, Co, Ni oder Mischungen dieser Hartstoffe in Pulverform eingesetzt werden.
- Verfahren nach Anspruch 1, bei dem Hartstoffpulver einer mittleren Korngröße von 0,5 bis 1,5 µm eingesetzt werden.
- Verfahren nach Anspruch 1, bei dem die Viskosität der Mischung aus Hartmetallpulver und verflüssigtem thermoplastischen Binder während der Herstellung und Verarbeitung auf einen Wert von 100 bis 2000 mPa s eingestellt wird.
- Verfahren nach Anspruch 1, bei dem das Hartmetallpulver in mehreren Stufen dem flüssigen thermoplastischen Binder zugegeben wird.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19546901A DE19546901C1 (de) | 1995-12-15 | 1995-12-15 | Verfahren zur Herstellung von Hartmetallbauteilen |
| DE19546901 | 1995-12-15 | ||
| PCT/EP1996/005452 WO1997022427A1 (de) | 1995-12-15 | 1996-12-05 | Verfahren zur herstellung von hartmetallbauteilen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0869857A1 EP0869857A1 (de) | 1998-10-14 |
| EP0869857B1 true EP0869857B1 (de) | 2001-03-07 |
Family
ID=7780246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96942363A Expired - Lifetime EP0869857B1 (de) | 1995-12-15 | 1996-12-05 | Verfahren zur herstellung von hartmetallbauteilen |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5972286A (de) |
| EP (1) | EP0869857B1 (de) |
| DE (2) | DE19546901C1 (de) |
| WO (1) | WO1997022427A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592695B1 (en) | 2000-11-16 | 2003-07-15 | General Electric Company | Binder system for ceramic arc discharge lamp |
| RU2538743C2 (ru) * | 2012-07-31 | 2015-01-10 | Рафаиль Исмагильевич Шайдулин | Способ изготовления изделий из порошков соединений ряда карбидов и связующая композиция для осуществления способа |
| KR101745134B1 (ko) * | 2015-09-14 | 2017-06-08 | 현대자동차주식회사 | 경량 피스톤핀 제조방법 |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2122960A (en) * | 1935-01-25 | 1938-07-05 | Gen Motors Corp | Refractory body and method of making same |
| DE680250C (de) * | 1936-12-02 | 1939-08-24 | Bosch Gmbh Robert | Verfahren zum Herstellen von keramischen Erzeugnissen, insbesondere von Zuendkerzensteinen |
| SU91236A1 (ru) * | 1948-09-08 | 1950-11-30 | П.О. Грибовский | Устройство дл формовани под давлением изделий из разжиженной шликерной массы |
| US3351688A (en) * | 1964-09-18 | 1967-11-07 | Lexington Lab Inc | Process of casting refractory materials |
| US3416905A (en) * | 1965-06-25 | 1968-12-17 | Lexington Lab Inc | Process for manufacture of porous abrasive articles |
| US4011291A (en) * | 1973-10-23 | 1977-03-08 | Leco Corporation | Apparatus and method of manufacture of articles containing controlled amounts of binder |
| US4094061A (en) * | 1975-11-12 | 1978-06-13 | Westinghouse Electric Corp. | Method of producing homogeneous sintered ZnO non-linear resistors |
| DD139397B1 (de) * | 1978-10-23 | 1988-02-17 | Dieter Berthold | Verfahren zur herstellung von stabil-dispersen systemen aus feinen pulvern in organischen substanzen |
| US4338272A (en) * | 1979-01-11 | 1982-07-06 | Canadian Patents & Development Limited | Slip-casting system |
| US4416603A (en) * | 1981-10-07 | 1983-11-22 | Peltsman Michael I | Low pressure hot molding machine |
| DD233117A1 (de) * | 1984-12-27 | 1986-02-19 | Hermsdorf Keramik Veb | Verfahren zur herstellung von spritzgiessmassen |
| DD233118A1 (de) * | 1984-12-27 | 1986-02-19 | Hermsdorf Keramik Veb | Verfahren zur herstellung von spritzgiessmassen |
| DD233119A1 (de) * | 1984-12-27 | 1986-02-19 | Hermsdorf Keramik Veb | Verfahren zur herstellung von keramischen spritzgiessmassen |
| US4708838A (en) * | 1985-03-26 | 1987-11-24 | Gte Laboratories Incorporated | Method for fabricating large cross section injection molded ceramic shapes |
| SU1590468A1 (ru) * | 1987-05-26 | 1990-09-07 | Московский химико-технологический институт им.Д.И.Менделеева | Термопластичное св зующее |
| DD281913A7 (de) * | 1987-06-17 | 1990-08-29 | Werk Fernsehelektronik Veb | Formwerkzeug zur formgebung von bauteilen aus formmassen |
| DE3808123A1 (de) * | 1988-03-11 | 1988-07-07 | Krupp Gmbh | Verfahren zur herstellung von sinterteilen aus feinkoernigen metall- oder keramikpulvern |
| US5059387A (en) * | 1989-06-02 | 1991-10-22 | Megamet Industries | Method of forming shaped components from mixtures of thermosetting binders and powders having a desired chemistry |
| DD286311A5 (de) * | 1989-07-19 | 1991-01-24 | Veb Keramische Werke Hermsdorf,De | Verfahren zum herstellen von formteilen aus sinterwerkstoffen durch spritzgiessen |
| US5403373A (en) * | 1991-05-31 | 1995-04-04 | Sumitomo Electric Industries, Ltd. | Hard sintered component and method of manufacturing such a component |
| US5328657A (en) * | 1992-02-26 | 1994-07-12 | Drexel University | Method of molding metal particles |
-
1995
- 1995-12-15 DE DE19546901A patent/DE19546901C1/de not_active Expired - Fee Related
-
1996
- 1996-12-05 DE DE59606559T patent/DE59606559D1/de not_active Expired - Fee Related
- 1996-12-05 US US09/091,096 patent/US5972286A/en not_active Expired - Fee Related
- 1996-12-05 EP EP96942363A patent/EP0869857B1/de not_active Expired - Lifetime
- 1996-12-05 WO PCT/EP1996/005452 patent/WO1997022427A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US5972286A (en) | 1999-10-26 |
| DE59606559D1 (de) | 2001-04-12 |
| DE19546901C1 (de) | 1997-04-24 |
| EP0869857A1 (de) | 1998-10-14 |
| WO1997022427A1 (de) | 1997-06-26 |
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